using line_gestao_api.Data;
using line_gestao_api.Dtos;
using line_gestao_api.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System.Globalization;
using System.Text;

namespace line_gestao_api.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    [Authorize]
    public class TrocaNumeroController : ControllerBase
    {
        private readonly AppDbContext _db;

        public TrocaNumeroController(AppDbContext db)
        {
            _db = db;
        }

        // ==========================================================
        // ✅ GET LIST (PAGINADO)
        // ==========================================================
        [HttpGet]
        public async Task<ActionResult<PagedResult<TrocaNumeroListDto>>> GetAll(
            [FromQuery] string? search,
            [FromQuery] int page = 1,
            [FromQuery] int pageSize = 20,
            [FromQuery] string? sortBy = "item",
            [FromQuery] string? sortDir = "asc")
        {
            page = page < 1 ? 1 : page;
            pageSize = pageSize < 1 ? 20 : pageSize;

            var q = _db.TrocaNumeroLines.AsNoTracking();

            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.Trim();
                var hasDateSearch = TryParseSearchDateUtcStart(s, out var searchDateStartUtc);
                var searchDateEndUtc = hasDateSearch ? searchDateStartUtc.AddDays(1) : DateTime.MinValue;
                q = q.Where(x =>
                    EF.Functions.ILike(x.LinhaAntiga ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.LinhaNova ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.ICCID ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Motivo ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Observacao ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Item.ToString(), $"%{s}%") ||
                    (hasDateSearch &&
                     x.DataTroca != null &&
                     x.DataTroca.Value >= searchDateStartUtc &&
                     x.DataTroca.Value < searchDateEndUtc));
            }

            var total = await q.CountAsync();

            var sb = (sortBy ?? "item").Trim().ToLowerInvariant();
            var desc = string.Equals((sortDir ?? "asc").Trim(), "desc", StringComparison.OrdinalIgnoreCase);

            q = sb switch
            {
                "item" => desc ? q.OrderByDescending(x => x.Item) : q.OrderBy(x => x.Item),
                "linhanova" => desc ? q.OrderByDescending(x => x.LinhaNova ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.LinhaNova ?? "").ThenBy(x => x.Item),
                "linhaantiga" => desc ? q.OrderByDescending(x => x.LinhaAntiga ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.LinhaAntiga ?? "").ThenBy(x => x.Item),
                "iccid" => desc ? q.OrderByDescending(x => x.ICCID ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.ICCID ?? "").ThenBy(x => x.Item),
                "datatroca" => desc ? q.OrderByDescending(x => x.DataTroca).ThenBy(x => x.Item) : q.OrderBy(x => x.DataTroca).ThenBy(x => x.Item),
                "motivo" => desc ? q.OrderByDescending(x => x.Motivo ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Motivo ?? "").ThenBy(x => x.Item),
                _ => desc ? q.OrderByDescending(x => x.Item) : q.OrderBy(x => x.Item)
            };

            var items = await q
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .Select(x => new TrocaNumeroListDto
                {
                    Id = x.Id,
                    Item = x.Item,
                    LinhaAntiga = x.LinhaAntiga,
                    LinhaNova = x.LinhaNova,
                    ICCID = x.ICCID,
                    DataTroca = x.DataTroca,
                    Motivo = x.Motivo,
                    Observacao = x.Observacao
                })
                .ToListAsync();

            return Ok(new PagedResult<TrocaNumeroListDto>
            {
                Page = page,
                PageSize = pageSize,
                Total = total,
                Items = items
            });
        }

        // ==========================================================
        // ✅ GET BY ID
        // ==========================================================
        [HttpGet("{id:guid}")]
        public async Task<ActionResult<TrocaNumeroDetailDto>> GetById(Guid id)
        {
            var x = await _db.TrocaNumeroLines.AsNoTracking().FirstOrDefaultAsync(a => a.Id == id);
            if (x == null) return NotFound();

            return Ok(ToDetailDto(x));
        }

        // ==========================================================
        // ✅ CREATE
        // ==========================================================
        [HttpPost]
        [Authorize(Roles = "admin,gestor")]
        public async Task<ActionResult<TrocaNumeroDetailDto>> Create([FromBody] CreateTrocaNumeroDto req)
        {
            var now = DateTime.UtcNow;

            var e = new TrocaNumeroLine
            {
                Id = Guid.NewGuid(),
                Item = req.Item ?? 0,
                LinhaAntiga = OnlyDigits(req.LinhaAntiga),
                LinhaNova = OnlyDigits(req.LinhaNova),
                ICCID = OnlyDigits(req.ICCID),
                DataTroca = ToUtc(req.DataTroca),
                Motivo = string.IsNullOrWhiteSpace(req.Motivo) ? null : req.Motivo.Trim(),
                Observacao = string.IsNullOrWhiteSpace(req.Observacao) ? null : req.Observacao.Trim(),
                CreatedAt = now,
                UpdatedAt = now
            };

            _db.TrocaNumeroLines.Add(e);
            await _db.SaveChangesAsync();

            return CreatedAtAction(nameof(GetById), new { id = e.Id }, ToDetailDto(e));
        }

        // ==========================================================
        // ✅ UPDATE
        // ==========================================================
        [HttpPut("{id:guid}")]
        [Authorize(Roles = "admin,gestor")]
        public async Task<IActionResult> Update(Guid id, [FromBody] UpdateTrocaNumeroRequest req)
        {
            var x = await _db.TrocaNumeroLines.FirstOrDefaultAsync(a => a.Id == id);
            if (x == null) return NotFound();

            if (req.Item.HasValue) x.Item = req.Item.Value;

            x.LinhaAntiga = OnlyDigits(req.LinhaAntiga);
            x.LinhaNova = OnlyDigits(req.LinhaNova);
            x.ICCID = OnlyDigits(req.ICCID);
            x.DataTroca = ToUtc(req.DataTroca);

            x.Motivo = string.IsNullOrWhiteSpace(req.Motivo) ? null : req.Motivo.Trim();
            x.Observacao = string.IsNullOrWhiteSpace(req.Observacao) ? null : req.Observacao.Trim();

            x.UpdatedAt = DateTime.UtcNow;

            await _db.SaveChangesAsync();
            return NoContent();
        }

        // ==========================================================
        // ✅ DELETE
        // ==========================================================
        [HttpDelete("{id:guid}")]
        [Authorize(Roles = "admin")]
        public async Task<IActionResult> Delete(Guid id)
        {
            var x = await _db.TrocaNumeroLines.FirstOrDefaultAsync(a => a.Id == id);
            if (x == null) return NotFound();

            _db.TrocaNumeroLines.Remove(x);
            await _db.SaveChangesAsync();
            return NoContent();
        }

        // ==========================================================
        // HELPERS
        // ==========================================================
        private static TrocaNumeroDetailDto ToDetailDto(TrocaNumeroLine x) => new()
        {
            Id = x.Id,
            Item = x.Item,
            LinhaAntiga = x.LinhaAntiga,
            LinhaNova = x.LinhaNova,
            ICCID = x.ICCID,
            DataTroca = x.DataTroca,
            Motivo = x.Motivo,
            Observacao = x.Observacao,
            CreatedAt = x.CreatedAt,
            UpdatedAt = x.UpdatedAt
        };

        private static DateTime? ToUtc(DateTime? dt)
        {
            if (dt == null) return null;
            var v = dt.Value;
            return v.Kind == DateTimeKind.Utc ? v :
                   (v.Kind == DateTimeKind.Local ? v.ToUniversalTime() : DateTime.SpecifyKind(v, DateTimeKind.Utc));
        }

        private static string OnlyDigits(string? s)
        {
            if (string.IsNullOrWhiteSpace(s)) return "";
            var sb = new StringBuilder();
            foreach (var c in s) if (char.IsDigit(c)) sb.Append(c);
            return sb.ToString();
        }

        private static bool TryParseSearchDateUtcStart(string value, out DateTime utcStart)
        {
            utcStart = default;
            if (string.IsNullOrWhiteSpace(value)) return false;

            var s = value.Trim();
            DateTime parsed;

            if (DateTime.TryParse(s, new CultureInfo("pt-BR"), DateTimeStyles.None, out parsed) ||
                DateTime.TryParse(s, CultureInfo.InvariantCulture, DateTimeStyles.None, out parsed))
            {
                utcStart = DateTime.SpecifyKind(parsed.Date, DateTimeKind.Utc);
                return true;
            }

            return false;
        }
    }
}